| http://www.w3.org/ns/prov#value | - A self-supporting pressure-tight container, especially for tennis balls, said container consisting of a strip of a multi-layer foil defining an inner surface and an outer surface of said container, said strip having spaced opposite edges, said foil including a layer impermeable to gas, and at least one layer capable of withstanding the pressure within the container, the layers defining said inner
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